Water generally represents “natural truth,” or true concepts about day-to-day matters and physical things. Since all water ultimately flows into the seas, then, it follows that a sea represents a huge agglomeration of such natural truths -- usually all of the natural truth a person has, or all the natural truth a church has. Water in the sea mixes freely, and is easily stirred up by winds and currents. This is also true of the concepts we hold about natural things -- they are not all related to each other, and when relationships do exist they usually can change without damaging the concepts themselves. Many of the concepts are easily disputed, and arguments can arise like waves on the ocean -- generally with little effect other than a mixing of waters. But the sea also offers great bounty. We draw fish from it (spiritual food), float ships (doctrinal systems) on it, bathe in it (using true concepts to purify ourselves), and the water that evaporates from it and falls as rain (purer forms of truth that can attach to desires for good) makes life possible.

50. Was in the isle that is called Patmos, signifies revelation to the nations. This is evident from the signification of "Patmos," as being the revelation contained in Revelation; for all places mentioned in the Word signify things, and the things they signify are from the worship there, or from some memorable event that occurred there, or from their location in or near countries whereby the religious principle of the nation is signified. "Patmos" signifies revelation, from the memorable fact that there a revelation was made to John. The revelation was made on an island, because an "island" signifies a nation remote from true worship, but still desiring to be enlightened. That this is signified by "islands" in the Word, will be clear from what follows; in the first place something shall be said about names of places in the Word signifying things.

All persons mentioned in the Word, and all by whom the Word was written, were led to places that were significant, in order that all things might be significative of spiritual things. Even the Lord Himself, for the same reason, went to places thus significative; as into Galilee, to Tyre and Sidon, to Jerusalem, and to the Mount of Olives there, and also, when an infant, He was carried into Egypt. It was similar with the prophets, and with many who are mentioned in the historical Word, as may be abundantly shown. For this reason, John also was commanded to betake himself into the isle of Patmos, that the things that are to be at the end of the church might there be revealed, because "island" signifies a nation about to accept truths of doctrine. This island, moreover, is in the archipelago, where there are numerous other islands; and from this also it is that by "Greece" in the Word such nations are signified. (Thus in Daniel 8:21, 10:20; 11:2; John 12:20-21; Mark 7:26.) (That all names of places mentioned in the Word signify things, see Arcana Coelestia (Arcana Coelestia 1224, 1264, 1876, 1888, 4310, 4442, 10329)

[2] That "islands" signify nations that are about to accede to the true worship of God, is evident from the following passages. In Isaiah:

Glorify Jehovah in Urim, the name of the God of Israel in the isles of the sea (Isaiah 24:15).

In the same:

He shall not quench nor break, until He have set judgment in the earth: and the isles shall hope in His law. Sing unto Jehovah a new song, His praises, ye ends of the earth: ye that go down to the sea, the isles, and the inhabitants thereof. Let them give glory unto Jehovah, and declare His praise in the islands (Isaiah 42:4, 10, 12).

In the same:

Listen, O isles, unto Me, and hearken, ye peoples from afar (Isaiah 49:1).

In the same:

The isles shall hope in Me, and on My arm shall they trust (Isaiah 51:5).

In the same:

The islands shall trust in Me, and the ships of Tarshish (Isaiah 60:9).

In Jeremiah:

Hear the words of Jehovah, O ye nations, and declare them in the isles afar off (Jeremiah 31:10).

And in Zephaniah:

Jehovah will make lean all the gods of the earth, that they may worship Him, everyone in his place, even all the isles of the nations (Zephaniah 2:11).

(And elsewhere as in Isaiah 23:2, 6 (Isaiah 23:6); Isaiah 41:1, 5; 42:15; 66:19; Jeremiah 2:10; 25:22; Ezekiel 27:3 (Ezekiel 27:3), 7, 15, 35.) From these and other passages it is plain that "isles" signify nations, specifically nations in respect to the doctrine of truth, in other places in respect to the doctrine of falsity; for most things in the Word have also opposite significations.